Q: Which is the best definition of an exterior angle of a triangle?

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Any triangle with a 90 degree angle is a right triangle.

a triangle w/ an angle perpendicular like this l_

There are several different formulas. The best one to use depends on what information you have about the rest of the triangle.

A triangle is said to be well-conditioned when no angle in it is less than 30 degrees or greater than 120 degrees. An equilateral triangle is considered to be the best-condition or ideal triangle.

the characteristeristics that describes a right isosceles traingle is all sides are equal twosidesmeet at a 90 angle

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Any triangle with a 90 degree angle is a right triangle.

the point where the three angle bisectors of the triangle intersect

a triangle w/ an angle perpendicular like this l_

The theorem is best described "If the hypotenuse and an acute angle of a right triangle are equal respectively to the corresponding parts of another right triangle, then the triangles are congruent."

There are several different formulas. The best one to use depends on what information you have about the rest of the triangle.

It is a 3 sided triangle with different side lengths and 3 interior angles of different sizes.

It is best described as a regular 10 sided polygon or as a regular decagon.

A triangle is said to be well-conditioned when no angle in it is less than 30 degrees or greater than 120 degrees. An equilateral triangle is considered to be the best-condition or ideal triangle.

All sides are different lengths; one angle measures 90°

the characteristeristics that describes a right isosceles traingle is all sides are equal twosidesmeet at a 90 angle

The angles of a classic Euclidian Triangle always add up to 180 degrees. The best way to remember this is a equilateral triangle (all sides same length and all angles the same angle) has 60 degree angles (3 of them = 3 x 60 = 180). In your case, 78 +33 = 111 your missing angle is 180 -111 = 69 degrees.

Pythagoras' famous theorem stated that for any right angle triangle that its hypotenuse when squared is equal to the sum of its squared sides.